Figaro, Festive Boi

At the beginning of each players upkeep, that
player reveals the top 4 cards of their library,
then exiles a card at random from among those
cards. They may play or cast that card as long as
it remains in exile.
Whenever a player plays or casts a card from
exile, put a +1/+1 counter on Figaro, Festive Boi.